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Genetic divergence and allozyme variation within and among populations of Hedysarum spinosissimum subsp. capitatum and subsp. spinosissimum (Papilionaceae)
Author(s) -
Baatout Hédi,
Marrakchi Mohamed,
Combes Daniel
Publication year - 1991
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/1222978
Subject(s) - biology , subspecies , outcrossing , botany , genetic variation , genetic divergence , taxon , genetic distance , gene flow , genetics , gene , zoology , population , genetic diversity , pollen , demography , sociology
Summary Baatout, H.; Marrakchi, M. & Combes, D.: Genetic divergence and allozyme variation within and among populations of Hedysarum spinosissimum subsp. capitatum and subsp. spinosissimum (Papilionaceae). ‐ Taxon 40: 239–252. 1991. ‐ ISSN 0040‐0262. Three outcrossing populations of Hedysarum spinosissimum subsp. capitatum and two self‐pollinating populations of H. spinosissimum subsp. spinosissimum were surveyed for variation at 36 allozyme loci. The proportion of polymorphic loci ranged from 25.0 to 75.0 % in subsp. capitatum and from 27.8 to 30.6 % in subsp. spinosissimum , and the mean heterozygosity from 0.088 to 0.299 in subsp. capitatum and from 0.086 to 0.097 in subsp. spinosissimum. No karyotypic differences distinguish the two subspecies, and no hybridization between the allogamous H. spinosissimum subsp. capitatum and the autogamous subsp. spinosissimum was noted. Allele frequency differences between the two subspecies indicate that they are clearly distinct in several genes coding for the enzymes peroxidase, esterase and acid phosphatase. The level of genetic divergence at the enzyme level, revealed by electrophoretic analysis of the two taxa, supports their specific distinctness, the mean genetic distance between them being 0.45 ‐ which is indicative of a long period of lack of gene flow between them.